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OPA847: 失调电压导致输出饱和

Part Number: OPA847
Other Parts Discussed in Thread: OPA657

如图,OPA847的输出直流偏置导致高电平到达输出上限电平3.5V,导致信号出现平顶。问题是:为什么不是上面的信号全部出现削顶,例如对于信号的最小值,都是平齐的;感觉上面的峰值,只要有一点超过3V就会直接拉到3.5V的平顶上面去(跳变),请问这是什么原因?